Warren County, Iowa
15 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
For most households in Warren County, the 15 tracked ZIP codes show adequate but uneven water quality.
How Warren County Compares
How Warren County Compares
Warren County scores 0 points above the Iowa state average (59/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Warren County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 9.7%, diabetes 9.8%)
Estimated additional annual cost per homeowner: $541, driven primarily by energy_code_gap
Infrastructure: 0.396% avg pipe failure probability, 40% of ZIPs at high risk
61.7% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $541
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,563 housing units in Warren County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Warren County
Remediation costs are relatively manageable for most homeowners in Warren County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Warren County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Warren County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Marion Company Rural Water District | 5,687 | 6 |
| 2 | Carlisle Water Supply | 4,170 | 3 |
| 3 | Des Moines Water Works | 246,055 | 3 |
| 4 | Milo Public Water Supply | 788 | 3 |
| 5 | MARTENSDALE WATER SUPPLY | 421 | 0 |
18 total water systems serve Warren County.
All ZIP Codes in Warren County
15 ZIP codes tracked in Warren County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 50160 | Martensdale | 70 | B | 0 | $176K |
| 2 | 50118 | Hartford | 66 | C | 0 | $177K |
| 3 | 50139 | Lacona | 66 | C | 0 | $138K |
| 4 | 50210 | New Virginia | 66 | C | 0 | $314K |
| 5 | 50125 | Indianola | 65 | C | 0 | $249K |
| 6 | 50047 | Carlisle | 63 | C | 3 | $223K |
| 7 | 50166 | Milo | 63 | C | 3 | $236K |
| 8 | 50211 | Norwalk | 63 | C | 0 | $294K |
| 9 | 50240 | Saint Charles | 62 | C | 0 | $297K |
| 10 | 50061 | Cumming | 58 | C | 0 | $517K |
| 11 | 50241 | Saint Marys | 55 | C | 0 | $169K |
| 12 | 50218 | Patterson | 53 | D | 0 | $107K |
| 13 | 50229 | Prole | 53 | D | 0 | $365K |
| 14 | 50033 | Bevington | 40 | D | 0 | — |
| 15 | 50145 | Liberty Center | 40 | D | 0 | $233K |
Recommended Buyer Guides for Warren County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 61.7% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Warren County, Iowa
Overview
Warren County in Iowa covers 15 ZIP codes with an average Home Safety Score of C (59/100).
2 of 15 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Iowa water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.